Located approximately 09° 44‘ latitude and 121° 11‘ longitude near the center, the Chocolate Hills of Bohol is one of the major geologic features of the Philippines. The Chocolate Hills were formed about 2 million years ago when most part of the islands was below a shallow sea involving coral reef formation and the deposition of remains of marine organisms such as corals, mollusks, algae and foraminifera. The land was later uplifted and eroded, forming valleys until isolated hills or haystack-like mounds known today as the Chocolate Hills were finally formed. The Chocolate Hills were declared a National Geological Monument on June 18,1988.